What Port 1845 Is
Port 1845 sits in the registered ports range (1024-49151). These ports are managed by the Internet Assigned Numbers Authority (IANA), which accepts requests from individuals and organizations who want to claim a port number for a specific service.
Port 1845 was registered under the name altalink for both TCP and UDP. That is the entirety of what IANA records about it. No RFC. No specification. No documentation of what the protocol does, how it works, or who would use it.
This makes port 1845 a registered ghost.
The Registered Ports Range
The registered range exists between the well-known ports (0-1023, reserved for foundational Internet services like HTTP, DNS, and SSH) and the ephemeral ports (49152-65535, used temporarily by your operating system for outbound connections).
Registered ports are available on a first-come, first-served basis. Anyone can apply. IANA records the name and contact, but does not verify that the protocol actually exists, that software implements it, or that anyone uses it. The registry is an address book, not a certificate of authenticity.
The result: thousands of registered ports are either dormant registrations from projects that never shipped, or placeholders from the early Internet era when developers claimed ports speculatively.
Port 1845 appears to be one of these.
What "Altalink" Is Not
The name "altalink" in the IANA registry has no documented connection to:
- Xerox AltaLink — the line of multifunction printers
- AltaLink, L.P. — the Canadian electricity transmission company
Both of those are real organizations. The IANA registration predates them or is unrelated. The name collision is coincidence.
If You See Port 1845 on Your System
If port 1845 shows up in your network traffic or process list, it is almost certainly being used by a local application that chose it informally — not because of the IANA registration. Applications sometimes pick obscure registered ports precisely because they are uncontested in practice.
To see what is listening on port 1845 on your machine:
macOS / Linux:
Windows:
The output will tell you the process ID. From there, you can identify which application opened the port.
Why This Matters
Every port that exists on paper but not in practice represents a small lesson in how the Internet actually works. The port number system was designed to create order — a reliable map of which door leads where. But the map and the territory diverge constantly.
Well-known ports (0-1023) are tightly controlled and meaningful. Registered ports are loosely controlled and increasingly noisy. By the time you reach the upper registered range, you find more gaps, more ghosts, and more ports used by applications that never told IANA they existed.
Port 1845 is harmless. If you see it in use, check what opened it. If you do not see it in use, you probably never will.
آیا دا پاڼه ګټوره وه؟